What is RS- 232C serial port ?

What is RS- 232C serial port ?
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Answer :

: RS-232C serial port ( RS-232C serial port) This port connects the mouse to the computer via a thin electrical wire. This cable uses a 9 pin connector. Serial part mouse is attached to the serial part with COM1 or COM2 . The cable connector attached to the mouse is 9 PIN FEMALE . There is another 9 PIN MALE on the back of the computer .
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